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Can I ask you another question? Genetically, how is it different from Brassyback? It is different from Brassyback, because Brassy cocks are black with gold saddles, but the hens are just like ruddies. Maybe brassybacks carry 2 melanin enhancers?
Brassybacks may have a different melanizer. Eg if ruddies have melanotic, they may have charcoal. Or vice versa.
Or indeed one extra melanizer, maybe both melanotic and charcoal.
Over here in Holland brassy backs are wheaten based but the hens look different (black hackle and tail, wheaten body)